Drift waves

In plasma physics, a drift wave is a type of collective excitation that is driven by a pressure gradient within a magnetised plasma, which can be destabilised by differences between ion and electron motion (then known as drift-wave instability or drift instability). The drift wave typically propagates across the pressure gradient and is perpendicular to the magnetic field. It can occur in relatively simple configurations such as in a column of plasma with a non-uniform density but a straight magnetic field.[1] Drift wave turbulence is responsible for the transport of particles, energy and momentum across magnetic field lines.[2] The characteristic frequency associated with drift waves involving electron flow[3] is given by [math]\displaystyle{ \omega^* = k_\perp \left(-\frac{k_BT_e}{eB_0}\nabla n_0\right) , }[/math] where [math]\displaystyle{ k_\perp }[/math] is the wavenumber perpendicular to the pressure gradient of the plasma, [math]\displaystyle{ k_B }[/math] is the Boltzmann constant, [math]\displaystyle{ T_e }[/math] is the electron temperature, [math]\displaystyle{ e }[/math] is the elementary charge, [math]\displaystyle{ B_0 }[/math] is the background magnetic field and [math]\displaystyle{ \nabla n_0 }[/math] is the density gradient of the plasma.

## References

1. ↑ Goldston, Robert J.; Rutherford, Paul H. (1995). "21. Drift waves and instabilities". Introduction to plasma physics. Bristol, UK: Institute of Physics. ISBN 0-7503-0325-5. OCLC 33079555. https://www.worldcat.org/oclc/33079555.
2. ↑ Horton, W. (1999). "Drift waves and transport" (in en). Reviews of Modern Physics 71 (3): 735–778. doi:10.1103/RevModPhys.71.735. ISSN 0034-6861. Bibcode: 1999RvMP...71..735H. https://link.aps.org/doi/10.1103/RevModPhys.71.735.
3. ↑ Chen, Francis F. (2016). "6.8 Resistive Drift Waves". Introduction to plasma physics and controlled fusion (3rd ed.). Cham. ISBN 978-3-319-22309-4. OCLC 933392530. https://www.worldcat.org/oclc/933392530.

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